/*
 * Copyright (c) 2011-2018, Meituan Dianping. All Rights Reserved.
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.dianping.cat.message;

/**
	* <p>
	* <code>Heartbeat</code> is used to log data that happens in a regular intervals, for example once per second, such as
	* system load, CPU percentage, memory usage, thread pool statistics, cache hit/miss rate, service manifest etc., and
	* even some configuration could be carried by <code>Heartbeat</code>. There could be some good use cases, for example
	* health checker and load balancer, that make good use of it.
	* </p>
	* <p>
	* <p>
	* <code>Heartbeat</code> should never be used per request since the request is not regular predictable, instead it
	* could be logged in a daemon background thread, or something like a Timer.
	* </p>
	* <p>
	* <p>
	* All CAT message will be constructed as a message tree and send to back-end for further analysis, and for monitoring.
	* Only <code>Transaction</code> can be a tree node, all other message will be the tree leaf.　The transaction without
	* other messages nested is an atomic transaction.
	* </p>
	*
	* @author Frankie Wu
	*/
public interface Heartbeat extends Message {

}
